Biology Multiple Choice Questions on Organisms and Populations

1. Organisms having the potential for interbreeding and producing fertile offspring is called
a) Class
b) Order
c) Genus
d) Species
 
2. A group of individuals of a plant or animal species, inhabiting a given area is called
a) Biome
b) Population
c) Ecosystem
d) Community
 
3. Climate includes
a) Seasonal variation
b) General patterns of atmosphere conditions
c) Average weather of an area
d) All of these
 
4. The maintenance of relatively constant internal environment is called
a) Homeostasis
b) Exotherms
c) Homeobox
d) Endotherms
 
5. Ultraviolet radiation which is not lethal but harm to the organism is
a) 0.1 to 0.28 µm
b) 0.28-0.32 µm
c) 0.32-0.4 µm
d) 0.4-0.5 µm
 
6. Ecological niche of an organism represents
a) The resource it utilizes
b) Functional role in the ecological system
c) The range of conditions that it can tolerate
d) all of these
 
7. Respiratory roots are known as

a) velamen
b) pneumatophores
c) hydathodes
d) prop roots
 

8. The gradual physiological adjustment to slowly changing new environmental conditions is known as
a) Selection
b) Introduction
c) Acclimatization
d) Quarantine
 
9.Upper layer of water in a single body of water is known as
a) Hypolimnion
b) Epilimnion
c) thermocline
d) Hydroline
 
10. The lower limit of water availability is soil is known as
a) field capacity
b) Hypolimnion
c) thermocline
d) wilting point
Learn More:

• Biology Practice Test on Biodiversity
• MCQ on Organisms and Populations
• Biology Quiz on Organisms and Populations
• Biology Practice Test on Ecology
• Quiz on Ecology

Answers:
1.  d) Species
2. b) Population
3. d) All of these
4. a) Homeostasis
5. b) 0.28-0.32 µm
6. d) all of these
7. b)pneumatophores
8. c) Acclimatization
9.  b) Epilimnion
10. d) wilting point